EP1519599B1 - Verfahren zur Steuerung des Schlafzeitintervalls in einem drahtlosen Breitband-Zugangskommunikationssystem - Google Patents

Verfahren zur Steuerung des Schlafzeitintervalls in einem drahtlosen Breitband-Zugangskommunikationssystem Download PDF

Info

Publication number
EP1519599B1
EP1519599B1 EP04018838A EP04018838A EP1519599B1 EP 1519599 B1 EP1519599 B1 EP 1519599B1 EP 04018838 A EP04018838 A EP 04018838A EP 04018838 A EP04018838 A EP 04018838A EP 1519599 B1 EP1519599 B1 EP 1519599B1
Authority
EP
European Patent Office
Prior art keywords
sleep
subscriber station
interval
mode
window value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04018838A
Other languages
English (en)
French (fr)
Other versions
EP1519599A3 (de
EP1519599A2 (de
Inventor
Jae-Hyoung Samsung Electronics Co. Ltd. Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of EP1519599A2 publication Critical patent/EP1519599A2/de
Publication of EP1519599A3 publication Critical patent/EP1519599A3/de
Application granted granted Critical
Publication of EP1519599B1 publication Critical patent/EP1519599B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02—Arrangements for increasing efficiency of notification or paging channel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a broadband wireless access communication system, and more particularly to a method and an apparatus for controlling a sleep mode and an awake mode in a broadband wireless access communication system using an orthogonal frequency division multiplexing method.
  • the 4th generation (hereinafter, referred to as '4G') communication system which is a next generation communication system, is being actively developed in order to provide services having different Quality of Service (hereinafter, referred to as 'QoS') levels.
  • the transmission rate of the 4G communication system is about 100 Mbps.
  • the 3rd generation (hereinafter, referred to as '3G') communication system usually provides a transmission speed of about 384 kbps under an outdoor channel environment which is a relatively-inferior channel environment and provides a transmission speed of about 2Mbps under an indoor channel environment which is a relatively-superior channel environment.
  • a wireless local area network (hereinafter, referred to as 'LAN') system and a wireless metropolitan area network (hereinafter, referred to as 'MAN') system generally provides transmission speeds of about 20Mbps to 50Mbps.
  • a new communication system which is achieved by supplementing the wireless LAN and MAN systems to combine a relatively-high transmission speed with mobility and QoS, has been developed in the current 4G communication system.
  • the wireless MAN system is suitable for high-speed communication services because it has a wide service coverage area and provides a high transmission speed. However, since the wireless MAN system can not compensate for the mobility of a subscriber station SS, handoff techniques are not being considered in the wireless MAN system.
  • a wireless MAN system is a type of broadband wireless access communication system (BWA) capable of providing a wider service coverage area and a higher transmission speed than those of a wireless LAN system.
  • BWA broadband wireless access communication system
  • the IEEE 802.16a communication system applies an orthogonal frequency division multiplexing (hereinafter, referred to as OFDM) method and an orthogonal frequency division multiplex access (hereinafter, referred to as OFDMA) method to a physical channel of the wireless MAN system.
  • OFDM orthogonal frequency division multiplexing
  • OFDMA orthogonal frequency division multiplex access
  • the IEEE 802.16a communication system utilizes the OFDM/OFDMA methods. Since the IEEE 802.16a communication system applies the OFDM/OFDMA method to the MAN system, it is possible for the IEEE 802.16a communication system to transmit a physical channel signal by using a plurality of sub-carriers in order to transmit high-speed data.
  • both IEEE 802.16a and IEEE 802.16e communication systems are broadband wireless access communication systems using the OFDM/OFDMA methods.
  • OFDM/OFDMA OFDM/OFDMA
  • the IEEE 802.16e communication system supplements the subscriber station to compensate for the mobility of a subscriber terminal (SS (Subscriber Station)), an MS (Mobile Station) or an MSS (Mobile Subscriber Station).
  • SS Subscriber Station
  • MS Mobile Station
  • MSS Mobile Subscriber Station
  • the IEEE 802.16a communication system does not compensate for the mobility of the subscriber stations.
  • the above IEEE 802.16a communication system is based on a fixed state of the subscriber stations and a single cell structure.
  • the IEEE 802.16e communication system is a system achieved by supplementing the IEEE 802.16a communication system with means to compensate for the mobility of the subscriber stations. Accordingly, the IEEE 802.16e communication system is required to consider the mobility of the subscriber stations under a multi-cell environment. To provide mobility to the subscriber stations under such a multi-cell environment, it is necessary to change the operating mode of the subscriber stations and the base station.
  • FIG 2 is a diagram illustrating the sleep mode operation proposed by the IEEE 802.16e communication system.
  • the sleep mode has been proposed in order to minimize power consumption of the subscriber stations during an idle interval, during which packet data is not transmitted.
  • the subscriber stations and the base station simultaneously perform a mode change into the sleep mode in such a manner that power consumption of the subscriber stations is minimized through the sleep mode during the idle interval in which packet data is not transmitted.
  • the base station and the subscriber stations simultaneously change modes into the awake modes to transmit/receive the packet data.
  • the sleep mode operation has been proposed for minimizing interference between channel signals. Also, the sleep mode operation must be capable of flexible operation consider traffic characteristics and transmission mode characteristics of the packet data, because the characteristics of the packet data are greatly affected by the traffic.
  • reference numeral 31 represents a packet data generation pattern.
  • the packet data generation pattern includes a plurality of 'on' intervals and 'off' intervals.
  • the 'on' intervals are burst intervals during which the packet data is generated and the 'off' intervals are idle intervals during which no packet data is generated.
  • the subscriber stations and the base station perform the mode change between the sleep mode and the awake mode to coincide with the packet data generation pattern so that power consumption of the subscriber stations is minimized and mutual interference between channel signals is eliminated.
  • Reference numeral 33 represents a mode change pattern of the base station and the subscriber stations.
  • the mode change pattern includes a plurality of awake modes and sleep modes. In the awake modes, the packet data is generated. The base station and the subscriber stations communicate with each other through the packet data in the awake mode. In contrast, the packet data is not generated in the sleep modes. The base station and the subscriber stations do not communicate with each other through packet data in the sleep mode.
  • Reference numeral 35 represents a power level pattern of the subscriber station SS POWER LEVEL.
  • the SS POWER LEVEL of the awake mode is represented as 'K' and the SS POWER LEVEL of the sleep mode is represented as 'M'.
  • the value of 'M' is much less than that of 'K'. Since there is no transmission/reception of the packet data during the sleep mode the power consumption is at a minimum.
  • the subscriber stations must obtain approval below the base station for the mode change into the sleep mode.
  • the base station is required to perform a buffering operation and a dropping operation for the packet data to be transmitted while approving the mode change of the subscriber stations into the sleep mode.
  • the base station is required to notify the subscriber stations if the existence of the packet data to be transmitted during a listening interval of the subscriber stations. At this time, the subscriber stations are required to awake from the sleep mode and check for the existence of the packet data to be transmitted thereto from the base station.
  • the listening interval will be described in detail further below.
  • a listening interval is requested for the subscriber station.
  • the listening interval represents a time interval required for the subscriber station to receive downlink messages (e.g., a traffic indicator TRF-IND message) from the base station after awaking from the sleep mode.
  • downlink messages e.g., a traffic indicator TRF-IND message
  • the subscriber station When the subscriber station performs the mode change into the sleep mode, the subscriber station regards the predetermined minimum window value as a minimum sleep mode period in order to determine the sleep interval. After the sleep interval elapses, the subscriber station awakes from the sleep mode and checks determines if packet data exists to be transmitted from the base station.
  • the sleep response message is a response message for the sleep request message.
  • the sleep response message can be used to represent whether or not the base station approves or denies the mode change into the sleep mode requested by the subscriber station. Also, the sleep response message can be used to represent an unsolicited instruction.
  • the sleep response message includes information required for the subscriber station to operate in the sleep mode.
  • the format of the sleep response message is represented in following Table 2.
  • the sleep response message is also a dedicated message transmitted on the basis of the connection identification of the subscriber station.
  • each IE of the sleep response message shown in Table 2 will be described.
  • the management message type MANAGEMENT MESSAGE TYPE represents the type of a message which is currently being transmitted.
  • the sleep approved SLEEP-APPROVED value is one bit.
  • a sleep approved value of '0' represents that the mode change into the sleep mode is denied.
  • a sleep approved value of '1' represents that the mode change into the sleep mode is approved. If the sleep approved value is '0', is the sleep response message contains a reservation field having 7 bits. If the sleep approved value is '1', is the sleep response message contains a start time value, the minimum window value, the maximum window value, and the listening interval.
  • the minimum window MIN-WINDOW value represents a start value for the SLEEP INTERVAL (measured in frames).
  • the maximum window MAX-WINDOW represents a stop value for the SLEEP INTERVAL (measured in frames).
  • the listening interval LISTENING INTERVAL represents a value for the listening interval (measured in frames).
  • the traffic indication message is transmitted to the subscriber station by the base station during the listening interval and indicates the existence of packet data to be transmitted to the subscriber station by the base station.
  • the format of the traffic indication message is represented in following Table 3.
  • the traffic indication message is transmitted in a broadcasting method, which is different from the transmitting methods for the sleep request message and the sleep response message.
  • the traffic indication message indicates whether or not there exists packet data to be transmitted to predetermined subscriber stations by the base station.
  • the subscriber station decodes the broadcasted traffic indication message and determines whether to perform the mode change into the awake mode or to maintain the sleep mode. The subscriber station awakens for the above process.
  • the management message type MANAGEMENT MESSAGE TYPE indicates the type of a message which is currently transmitted.
  • the positive indication list POSITIVE_INDICATION_LIST includes the number of positive subscribers NUM-POSITIVE and connection identification of each positive subscriber.
  • the positive indication list represents the number of the subscriber stations to which packet data will be transmitted and connection identifications of the subscriber stations.
  • FIG 3 is a diagram illustrating a mode change procedure of a subscriber station into a sleep mode which has been proposed by the IEEE 802.16e communication system.
  • the base station 50 determines whether or not there is packet data to be transmitted to the subscriber station 40, and determines whether or not to approve the mode change of the subscriber station 40 into the sleep mode. As described in Table 2, if the base station 50 approves of the mode change into the sleep mode, the SLEEP-APPROVED value is set as '1'. In contrast, if the base station 50 denies the mode change into the sleep mode, the SLEEP-APPROVED value is set as '0'.
  • the other information elements included in the sleep response message are the same as that described in Table 2.
  • FIG 4 is a diagram illustrating a mode change procedure of the subscriber station into a sleep mode under the control of the base station which has been proposed for the IEEE 802.16e based communication system.
  • FIG 4 is a diagram illustrating a case where the subscriber station performs the mode change into the sleep mode according to the unsolicited instruction.
  • FIG 5 is a diagram illustrating a mode change procedure of the subscriber station into a awake mode under the control of the base station which has been proposed for use in an IEEE 802.16e based communication system.
  • the base station 50 transmits the traffic indication message to the subscriber station 40 (S51).
  • the traffic indication message includes the same information elements as described in Table 3.
  • the subscriber station 40 which has received the traffic indication message from the base station 50, checks whether or not the positive indication exits in the traffic indication message. If the positive indication exists, the subscriber station 40 determines is a connection identification is included in the traffic indication message.
  • the subscriber station 40 performs the mode change from a current mode, that is, the sleep mode into the awake mode (S53).
  • a subscriber station SS 60 transmits to a base station BS 70 a message requesting the sleep mode.
  • Parameters for the sleep request include a minimum window value, a maximum window value, and a listening interval which are established by the subscriber-station 60.
  • the subscriber station 60 After the subscriber station 60, which has received the sleep response message, operates in the sleep mode during the established time starting at the sleep mode starting time, the subscriber station 60 awakes during time assigned as the listening interval. If the subscriber station 60 in the awake mode receives the traffic indication message having the negative indication from the base station 70, the subscriber station 60 reenters the sleep mode for a predetermined time, which is double that of the previous sleep interval, after the listening interval lapses. If the subscriber station 60, which maintains the awake mode during the listening interval after the sleep mode has been finished, receives the traffic indication message having the positive indication, the subscriber station 60 maintains the awake mode regardless of time, and receives data transmitted from the base station 70, which is set for the mode change into the sleep mode.
  • the subscriber station determines that there does not exists packet data to be transmitted thereto after checking the traffic indication message, the subscriber station increases the sleep interval by an interval double that of the previous sleep interval and maintains the sleep mode during the time corresponding to the increased sleep interval after the listening interval lapses. While the above operation of increasing the sleep interval is being continuously repeated, if there is no packet data to be transmitted to the subscriber station, the sleep interval reaches the maximum window value.
  • FIG 7 is a diagram illustrating a conventional sleep mode. It is assumed that the minimum window value is 2ms, the maximum window value is 5ms, and the listening interval is 2ms.
  • the subscriber station maintains the sleep mode during the first stage of 2ms. After the first stage lapses, the subscriber station maintains the listening interval while powering on for the next 2ms.
  • the subscriber station maintains the second sleep mode after the listening interval of 2ms.
  • An aspect of the present invention is to provide a method for establishing a sleep interval which can re-establish the sleep interval by considering communication traffic conditions for data transmission between a base station and a subscriber station by repeating the sleep mode up to the maximum window value after the sleep interval for the sleep mode reaches a maximum window value from a minimum window value.
  • Another aspect of the present invention is to provide a method for establishing a sleep interval, which is capable of efficiently saving power of a system whenever a sleep mode loop is performed.
  • a further aspect of the present invention is to provide an apparatus for establishing a sleep interval according to the above-defined methods.
  • a method for establishing a sleep interval of a sleep mode in a broadband wireless access communication system comprising the steps of: placing a subscriber station into an awake mode when a preset time of a maximum window value lapses, and determining by the subscriber station if a first message representing that no data is to be transmitted is received from a base station; and placing the subscriber station into the sleep mode when the subscriber station receives the first message, and establishing a minimum window value for a present sleep mode to be greater than a predetermined minimum window value of a previous sleep mode loop within the maximum window value, wherein the previous sleep mode loop repeatedly performs the sleep mode from the preset minimum window value to the maximum window value, and the subscriber station performs a present sleep mode loop until the sleep mode of the maximum window value starting from the established minimum window value is finished.
  • the sleep mode loop is carried out so as to set the minimum window value as integer multiple of the initial minimum window value.
  • the sleep mode loop is repeatedly carried out such that the sleep mode is performed until the sleep interval reaches the maximum window value.
  • the minimum window value is established at multiples of the minimum window value of the previous sleep mode loop. Even if the sleep interval starting from the minimum window value peaches the maximum window value, the sleep mode loop is realized.
  • the sleep interval can be established depending on communication traffic conditions for data transmission carried out between the base station and the subscriber station.
  • FIG. 8 is a diagram illustrating a structure of a broadband wireless access communication system using an orthogonal frequency division multiplexing method and an orthogonal frequency division multiple access method.
  • an IEEE (Institute of Electrical and Electronics Engineers) 802.16e communication system is achieved by supplementing an IEEE 802.16a communication system with means to compensate for the mobility of a subscriber station SS
  • the IEEE 802.16e communication system When the IEEE 802.16e communication system is compensates for the mobility of the subscriber station, a multi-cell structure and handoff of the subscriber station between multi-cells can be considered. According to the present invention, a structure of the IEEE 802.16e communication system is proposed as shown in FIG. 8 .
  • the IEEE 802.16e communication system is a broadband wireless access (BWA) communication system using an orthogonal frequency division multiplexing (hereinafter, referred to as 'OFDM') method and an orthogonal frequency division multiple access (hereinafter, referred to as 'OFDMA') method.
  • BWA broadband wireless access
  • 'OFDM' orthogonal frequency division multiplexing
  • 'OFDMA' orthogonal frequency division multiple access
  • the IEEE 802.16e communication system has a multi-cell structure and includes a base station BS 110 controlling a first cell 100, a base station 140 controlling a second cell 150, and a plurality of subscriber stations 111, 113, 130, 151, and 153.
  • the IEEE 802.16e communication system is achieved by supplementing the IEEE 802.16a communication system with means for compensating the mobility of the subscriber station, power consumption of the subscriber station is a major factor to be considered while designing the IEEE 802.16e communication system.
  • a sleep mode operation and an awake mode operation corresponding to the sleep mode operation between the subscriber-station and the base station have been proposed.
  • the sleep mode operation and the awake mode operation proposed for the current IEEE 802.16e communication system exhibits problems in that there are no methods for controlling an operation after the sleep interval reaches a maximum window value when establishing the sleep interval.
  • the methods proposed by the present invention of establishing the sleep interval include a first method of continuously maintaining the sleep interval value as the maximum window value, and a second method of continuously repeating operations, in which the sleep interval value is set as the minimum window value and the sleep interval value is increased up to the maximum window value. Also, a third method of transmitting a sleep request message for establishing a new sleep interval when the sleep interval value reaches the maximum window value is contemplated.
  • the sleep mode is performed by using predetermined window values without considering the status of communication trade between the base station and each subscriber station.
  • the subscriber station requests from the base station the sleep request message for establishing a new sleep interval whenever the sleep interval value reaches the maximum window value, and receives a response corresponding to the sleep request message in order to establish the sleep mode.
  • the base station When the base station has no data to transmit, the base station transmits to the subscriber station a traffic indication message having negative information.
  • the subscriber station which has received the traffic indication message having negative information, continuously stays in the sleep mode. Since data to be transmitted by the base station is not transmitted in real time, the data is randomly generated.
  • the minimum window value is doubled after establishing the minimum window value greater than the initial minimum window value.
  • the subscriber station 220 If the sleep interval reaches the maximum window value, the subscriber station 220 maintains the sleep mode during the sleep interval 315 corresponding to the maximum window value. The subscriber station 220 then performs the mode change into the awake mode after the sleep interval 315 of the maximum window value lapses (S217). The subscriber station 220 receives the traffic indication message from the base station 240 (S218). If a received traffic indication message is the negative traffic indication message, the subscriber station 220 performs a second sleep mode loop in order to operate in the sleep mode.
  • the subscriber station 220 then maintains the sleep mode during the sleep interval 411 corresponding to a established minimum window value. If the sleep interval 411 lapses, the subscriber station 220 performs the mode change into the awake mode (S220), thereby receiving the traffic indication message from the base station 240 (S221).
  • the subscriber station 220 performs the mode change into the sleep mode (S222). At this time, the subscriber station 220 establishes the sleep interval used for remaining in the sleep mode as double that of the previous sleep interval. After the subscriber station 220 maintains the sleep mode during double time 412 as compared with the previous sleep mode, the subscriber station 220 performs the mode change into the awake mode (S223).
  • the sleep mode loop is carried out so as to set the minimum window value as integer multiple of the initial minimum window value.
  • the sleep mode loop is repeatedly carried out such that the sleep mode is performed until the sleep interval reaches the maximum window value.
  • the minimum window value is established as a multiple of the minimum window value of the previous sleep mode loop. Even if the sleep interval starting from the minimum window value reaches the maximum window value, the sleep mode loop is realized.
  • the sleep interval can be established depending on communication traffic conditions for data transmission carried out between the base station and the subscriber station.
  • the sleep interval can also be established by considerating communication traffic conditions between the base station and the subscriber station in both sleep mode and awake mode of the broadband wireless access communication system using the OFDM/OFDMA method, i.e., the IEEE 802.16e communication system so that it is possible to reduce unnecessary awaking times.
  • the power save of the IEEE 802.16e communication system which is an object of the sleep mode, can be efficiently achieved.
  • FIG. 10 is a diagram of parameters in relation to the sleep mode when performing an initial sleep mode loop according to the method of FIG. 9 .
  • FIG. 11 is a diagram of parameters in relation to the sleep mode when performing the second sleep mode loop according to the method of FIG. 9 .
  • the last sleep interval window value is 4.096sec, which is less than the maximum window value.
  • FIG. 12 is a diagram of parameters in relation to the sleep mode when performing a third sleep mode loop according to the method of FIG. 9 .
  • the subscriber station After the subscriber station maintains the sleep mode in the second sleep loop for 8ms, which is the minimum window value, the subscriber station is powered on for 2ms and maintains the awake mode during the listening interval. After the subscriber station maintains the awake mode for 2ms, the subscriber station performs the mode change into the sleep mode and maintains the sleep mode for 16ms.
  • the last sleep interval window value is 4.096sec, which is less than the maximum window value.
  • FIG. 13 is a diagram of parameters in relation to the sleep mode when performing 11 th , 12 th , and 13 th sleep mode loops according to the method of FIG. 9 .
  • the subscriber station After the subscriber station maintains the sleep mode in the 11 th sleep loop for 2.048sec, which is the minimum window value, the subscriber station is powered on for 2ms and maintains the awake mode during the listening interval. After the subscriber station maintains the awake mode for 2ms, the subscriber station performs the mode change into the sleep mode and maintains the sleep mode for 4.096sec.
  • the last sleep interval window value is 4.096sec, which is less than the maximum window value.
  • the subscriber station After the subscriber station maintains the sleep mode in the 12 th sleep loop for 4.096sec, which is the minimum window value, the subscriber station is powered on for 2ms and maintains the awake mode during the listening interval. After the subscriber station maintains the awake mode for 2ms, the subscriber station performs the mode change into the sleep mode and the sleep mode for 4.096sec.
  • the subscriber station After the subscriber station maintains the sleep mode in the 13 th sleep loop for 4.096sec, which is the minimum window value, the subscriber station is powered on for 2ms and maintains the awake mode during the listening interval. After the subscriber station maintains the awake mode for 2ms, the subscriber station performs the mode change into the sleep mode and maintains the sleep mode for 4.096sec.
  • FIG. 14 is a flow chart showing an operation of the subscriber station based on FIG 9 .
  • the subscriber station compares the above-calculated minimum window value with the maximum window value (S550). If the subscriber station determines that the minimum window value calculated by step 540 is less than the maximum window, the subscriber station repeatedly performs steps 520 to 550 performing the sleep mode according to the established sleep interval.
  • the subscriber terminal determines that the minimum window value calculated by step 540 is greater than the maximum window value, the subscriber terminal -calculates the sleep interval by Equation 2 (S560). After the subscriber station maintains the sleep mode during the calculated sleep interval, the subscriber station performs the sate transition into the awake mode and maintains the awake mode for 2ms, and then the subscriber station repeatedly performs the sleep mode again during the sleep interval calculated in step 560 (S570).
  • the subscriber station performs the mode change into the awake mode by turning on its power, to thereby receive data from the base station (S590).
  • the subscriber station After the subscriber station receives the positive traffic indication message from the base station and communicates data with the base station, the subscriber station initializes the minimum window value and the maximum window count. In other words, the subscriber station establishes the minimum window value as the initial window value (2ms), resets the maximum window count as '0', and then performs step 510 to step 590.
  • the sleep mode loop is carried out so as to set the minimum window value as an integer multiple of the initial minimum window value.
  • the sleep mode loop is repeatedly carried out such that the sleep mode is performed until the sleep interval reaches the maximum window value.
  • the minimum window value is established at multiples of the minimum window value of the previous sleep mode loop. Even if the sleep interval starting from the minimum window value reaches the maximum window value, the sleep mode loop is realized.
  • the sleep interval can be established depending on communication traffic conditions for data transmission carried out between the base station and the subscriber station.
  • the sleep interval can be established by considerating the communication traffic conditions between the base station and the subscriber station in both sleep mode and awake mode of the broadband wireless access communication system using the OFDM/OFDMA method, i.e., the IEEE 802.16e communication system, so that it is possible to reduce unnecessary awaking times.
  • the power save of the IEEE 802.16e communication system which is an object of the sleep mode, can be efficiently achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Claims (11)

  1. Verfahren zum Festlegen eines Schlaf-Intervalls eines Schlafmodus in einem Kommunikationssystem, wobei das Verfahren die folgenden Schritte umfasst:
    a) Empfangen eines anfänglichen minimalen Fenster-Wertes, eines maximalen Fenster-Wertes und eines Hörintervalls von der Basisstation an einer Teilnehmerstation; und Festlegen eines minimalen Fensters entsprechend dem anfänglichen minimalen Fensterwert; und
    b) Festlegen eines Schlaf-Intervalls entsprechend dem minimalen Fenster; und
    c) Versetzen der Teilnehmer-Station in einen Schlafmodus mit dem Schlaf-Intervall; und
    d) wenn das Schlaf-Intervall abläuft, Versetzen der Teilnehmer-Station in einen Wach-Modus mit dem Hör-Intervall; und
    e) Feststellen, ob während des Hör-Intervalls eine Verkehrsanzeigenachricht, die anzeigt, dass keine Daten zu senden sind, von der Basisstation empfangen wird, durch die Teilnehmer-Station, und wenn dies der Fall ist, Inkrementieren des Schlaf-Intervalls; und
    f) Wiederholen der Schritte c) bis e), bis das Schlaf-Intervall größer ist als der maximale Fensterwert;
    dadurch gekennzeichnet, dass
    wenn das Schlaf-Intervall größer ist als der maximale Fensterwert, Durchführen der folgenden Schritte:
    g) Vergrößem des minimalen Fensters um einen vorgegebenen Faktor; und
    h) wenn das vergrößerte minimale Fenster über dem maximalen Fensterwert liegt, Verkleinern des vergrößerten minimalen Fensters um den Faktor; und
    i) Wederholen der Schritte b) bis f).
  2. Verfahren nach Anspruch 1, das des Weiteren einen Schritt des Festlegens eines maximalen Fenster-Zählwertes als "0" umfasst, nachdem von der Basisstation der anfängliche minimale Fensterwert, der maximale Fensterwert und das Hör-Intervall empfangen worden sind.
  3. Verfahren nach Anspruch 2, wobei die Teilnehmerstation den maximalen Fenster-Zählwert immer dann um "1" erhöht, wenn das Schlaf-Intervall größer ist als der maximale Fenster-Wert, und so das minimale Fenster entsprechend: MinWindow = initialMinWindow * 2 MaxWindowCount , ∧
    Figure imgb0005
    berechnet, wobei initialMinWindow der anfängliche minimale Fensterwert ist und MaxWindowCount der maximale Fenster-Zählwert ist.
  4. Verfahren nach Anspruch 3, wobei die Teilnehmer-Station das minimale Fenster entsprechend der folgenden Gleichung berechnet, wenn das nach Anspruch 3 berechnete minimale Fenster größer ist als der maximale Fenster-Wert: MinWindow = initialMinWindow * 2 MaxWindowCount - 1 . ∧
    Figure imgb0006
  5. Verfahren nach Anspruch 4, das des Weiteren die folgenden Schritte umfasst:
    Einrichten des Schlaf-Intervalls so, dass es dem nach Anspruch 4 berechneten minimalen Fenster gleich ist; und
    Beibehalten des Schlaf-Intervalls, bis die Teilnehmerstation von der Basisstation eine Verkehrsanzeigenachricht erhält, die anzeigt, dass Daten zu senden sind.
  6. Verfahren nach einem der Ansprüche 1 bis 5, wobei der anfängliche minimale Fenster-Wert, der von der Basisstation empfangen wird, 2 ms beträgt, der maximale Fenster-Wert 5 s beträgt und das Hörintervall 2 ms beträgt.
  7. Verfahren nach Anspruch 1, wobei Inkrementieren des Schlaf-Intervalls Verlängern des Schlaf-Intervalls um einen Faktor 2 umfasst.
  8. Verfahren nach einem der Ansprüche 1 bis 7, wobei eine Verkehrsanzeigenachricht, die anzeigt, dass Daten zu senden sind, eine positive Verkehrsanzeigenachricht enthält, und eine Verkehrsanzeigenachricht, die anzeigt, dass keine Daten zu senden sind, eine negative Verkehrsanzeigenachricht enthält.
  9. Verfahren nach einem der Ansprüche 1 bis 8, wobei die Teilnehmerstation den maximalen Fenster-Zählwert als "0" festlegt, nachdem eine Verkehrsanzeigenachricht empfangen worden ist, die anzeigt, dass Daten zu senden sind.
  10. Verfahren nach Anspruch 1, wobei der Schritt des Vergrößerns des minimalen Fensters Senden einer Schlaf-Anforderungsnachricht zu der Basisstation durch die Teilnehmerstation zum Anfordern eines vergrößerten minimalen Fensters und Empfangen des vergrößerten minimalen Fensters von der Basisstation umfasst.
  11. Vorrichtung zum Festlegen eines Schlaf-Intervalls eines Schlaf-Modus in einem Kommunikationssystem, wobei die Vorrichtung umfasst:
    eine Empfangseinrichtung zum:
    a) Empfangen eines anfänglichen minimalen Fensterwertes, eines maximalen Fenster-Wertes und eines Hörintervalls von einer Basisstation; und
    eine Festlegeeinrichtung zum Festlegen eines minimalen Fensters entsprechend dem anfänglichen minimalen Fenster-Wert; und
    eine Festlegeeinrichtung zum:
    b) Festlegen eines Schlaf-Intervalls entsprechend dem minimalen Fenster; und
    eine Einrichtung zum Versetzen in den Schlafmodus zum
    c) Versetzen der Teilnehmerstation in einen Schlaf-Modus mit dem Schlaf-Intervall; und
    eine Einrichtung zum Versetzen in den Wach-Modus zum
    d) Versetzen der Teilnehmerstation in einen Wach-Modus mit dem Hör-Intervall, wenn das Schlaf-Intervall abläuft; und
    eine Feststelleinrichtung zum
    e) Feststellen, ob eine Verkehrsanzeigenachricht, die anzeigt, dass keine Daten zu senden sind, während des Höhr-Intervalls von der Basisstation empfangen wird, durch die Teilnehmerstation, und wenn dies der Fall ist, Inkrementieren des Schlaf-Intervalls; und
    wobei die Vorrichtung so eingerichtet ist, dass sie die Schritte c) bis e) wiederholt, bis das Schlaf-Intervall größer ist als der maximale Fenster-Wert; und dadurch gekennzeichnet, dass die Vorrichtung des Weiteren so eingerichtet ist, dass sie, wenn das Schlaf-Intervall länger ist als der maximale Fenster-Wert,
    g) das minimale Fenster um einen vorgegebenen Faktor vergrößert; und
    h) das vergrößerte minimale Fenster um den Faktor verkleinert, wenn das vergrößerte minimale Fenster über dem maximalen Fenster-Wert liegt; und
    i) die Schritte b) bis f) wiederholt.
EP04018838A 2003-09-26 2004-08-09 Verfahren zur Steuerung des Schlafzeitintervalls in einem drahtlosen Breitband-Zugangskommunikationssystem Expired - Lifetime EP1519599B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR2003067085 2003-09-26
KR1020030067085A KR100594009B1 (ko) 2003-09-26 2003-09-26 광대역 무선 접속 통신 시스템에서 슬립 구간 설정 방법

Publications (3)

Publication Number Publication Date
EP1519599A2 EP1519599A2 (de) 2005-03-30
EP1519599A3 EP1519599A3 (de) 2005-09-28
EP1519599B1 true EP1519599B1 (de) 2008-10-15

Family

ID=34192275

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04018838A Expired - Lifetime EP1519599B1 (de) 2003-09-26 2004-08-09 Verfahren zur Steuerung des Schlafzeitintervalls in einem drahtlosen Breitband-Zugangskommunikationssystem

Country Status (5)

Country Link
US (1) US7289804B2 (de)
EP (1) EP1519599B1 (de)
KR (1) KR100594009B1 (de)
CN (1) CN1602013A (de)
DE (1) DE602004017098D1 (de)

Families Citing this family (54)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6950645B1 (en) * 2000-09-28 2005-09-27 Palmsource, Inc. Power-conserving intuitive device discovery technique in a bluetooth environment
US6721569B1 (en) * 2000-09-29 2004-04-13 Nortel Networks Limited Dynamic sub-carrier assignment in OFDM systems
WO2005022772A1 (en) * 2003-08-29 2005-03-10 Samsung Electronics Co., Ltd. Apparatus and method for controlling operational states of medium access control layer in a broadband wireless access communication system
CA2760916C (en) * 2004-03-04 2013-12-10 Samsung Electronics Co., Ltd. A system and method for performing location update
KR100885158B1 (ko) * 2004-08-09 2009-02-23 엘지전자 주식회사 광대역 무선접속 시스템에서 수면모드 단말의 주기적인레인징방법
US7408887B2 (en) * 2004-10-27 2008-08-05 Intel Corporation Methods and apparatus for operating a wireless electronic device based on usage pattern
WO2006049460A1 (en) * 2004-11-04 2006-05-11 Samsung Electronics Co., Ltd. Apparatus and method for signal transmission and reception using downlink channel information in a sleep mode in a bwa communication system
US8379553B2 (en) * 2004-11-22 2013-02-19 Qualcomm Incorporated Method and apparatus for mitigating the impact of receiving unsolicited IP packets at a wireless device
US7593745B2 (en) * 2005-01-05 2009-09-22 Faraday Technology Corp. Method for operating wireless local area network cards in a power-saving mode
KR101084129B1 (ko) * 2005-03-24 2011-11-17 엘지전자 주식회사 광대역 무선접속 시스템에서의 슬립모드 지원 방법
KR100913087B1 (ko) 2005-06-09 2009-08-21 엘지전자 주식회사 전력소모 방지 모드에서 핸드오버 제어 방법
KR20070024302A (ko) * 2005-08-26 2007-03-02 한국전자통신연구원 셀룰러 시스템의 수면 모드 제어 장치 및 제어 방법
KR100725406B1 (ko) * 2005-09-26 2007-06-07 삼성전자주식회사 다수의 전력 절약 모드를 가지는 무선 통신 장치에서리스닝 구간을 조절하여 전력을 절약하는 방법 및 장치
US20070160027A1 (en) * 2005-12-27 2007-07-12 Muqattash Alaa H Dynamic power save modes
US8135427B2 (en) 2006-02-06 2012-03-13 Olympus Corporation Power save system and method
US7567820B2 (en) * 2006-02-09 2009-07-28 Altair Semiconductor Ltd. Scanning for network connnections with variable scan rate
US7545787B2 (en) * 2006-02-09 2009-06-09 Altair Semiconductor Ltd. Simultaneous operation of wireless LAN and long-range wireless connections
US7542728B2 (en) * 2006-02-09 2009-06-02 Altair Semiconductor Ltd. Dual-function wireless data terminal
US9258833B2 (en) 2006-02-09 2016-02-09 Altair Semiconductor Ltd. LTE/Wi-Fi coexistence
US8160001B2 (en) * 2006-05-25 2012-04-17 Altair Semiconductor Ltd. Multi-function wireless terminal
KR100961706B1 (ko) * 2006-02-28 2010-06-10 삼성전자주식회사 무선 통신 시스템의 슬립 모드 동작 제어 시스템 및 방법
US7916687B2 (en) * 2006-03-03 2011-03-29 Qualcomm Incorporated Standby time improvements
US8880104B2 (en) * 2006-03-03 2014-11-04 Qualcomm Incorporated Standby time improvements for stations in a wireless network
US8433374B2 (en) * 2006-04-27 2013-04-30 Qualcomm Incorporated Method and system for selecting a sleep interval to improve battery life
US7751858B2 (en) * 2006-05-05 2010-07-06 Intel Corporation Sleep-mode statistics apparatus, systems, and methods
US7769362B2 (en) 2006-06-23 2010-08-03 Olympus Corporation System and method for power management
US20080009328A1 (en) * 2006-07-05 2008-01-10 Motorola, Inc. Sleep mode optimization for reducing battery life in broadband wireless communication devices
US9332496B2 (en) * 2006-11-28 2016-05-03 Marvell World Trade Ltd. Enhanced IEEE power save in ad hoc wireless mode
KR101402986B1 (ko) 2006-12-01 2014-06-03 삼성전자주식회사 광대역 무선 접속 시스템에서의 수면 모드 관리 장치 및 그방법
US8619652B2 (en) * 2006-12-04 2013-12-31 Samsung Electronics Co., Ltd. System and method for adaptive sleep of wirelessly networked devices
US8826348B2 (en) * 2006-12-04 2014-09-02 Samsung Electronics Co., Ltd. System and method for wireless communication of uncompressed video having a relay device for power saving
KR100925712B1 (ko) * 2007-01-22 2009-11-10 삼성전자주식회사 광대역 무선통신 시스템에서 슬립 모드 진입을 제어하기위한 장치 및 방법
CN101237640B (zh) * 2007-01-30 2014-06-04 世意法（北京）半导体研发有限责任公司 在宽带无线接入通信系统中用于实时服务的睡眠模式控制
US7787406B2 (en) * 2007-04-18 2010-08-31 Intel Corporation Methods and arrangements for adaptively changing snoozing intervals of wireless devices
KR100897424B1 (ko) * 2007-05-14 2009-05-14 한국전자통신연구원 수면 모드를 제공하는 방법과 이를 위한 이동 단말기
KR101340177B1 (ko) 2007-10-19 2014-01-15 삼성전자주식회사 통신 시스템에서 슬립모드 동작 제어 방법 및 장치
US8121144B2 (en) * 2007-11-20 2012-02-21 Altair Semiconductor Ltd. Multi-function wireless terminal
US8095106B2 (en) * 2008-02-14 2012-01-10 Industrial Technology Research Institute System and method for power savings in a wireless communication network
KR101094431B1 (ko) * 2008-02-28 2011-12-15 한국전자통신연구원 이동 통신 시스템에서 전력 절약 동작 관리 방법
US9237523B2 (en) 2008-07-07 2016-01-12 Mediatek Inc. Method of establishing sleep mode operation for broadband wireless communications systems
US20100067416A1 (en) * 2008-09-15 2010-03-18 Qualcomm Incorporated Re-programming media flow phone using speed channel switch time through sleep time line
US8638701B2 (en) * 2008-09-26 2014-01-28 Nxp, B.V. Methods and apparatus for power saving in personal area networks
US8699509B2 (en) * 2008-10-29 2014-04-15 Qualcomm Incorporated Methods and systems for diversity idle mode in a mobile station
KR101718496B1 (ko) * 2008-10-30 2017-03-21 한국전자통신연구원 다중 반송파 관리 장치 및 방법과 단말의 수면 모드 동작 방법
EP2205029A1 (de) * 2009-01-06 2010-07-07 Thomson Licensing Verfahren zum Planen der Wach-/Schlafzyklen von einer zentralen Vorrichtung in einem Funknetzwerk
KR101564107B1 (ko) * 2009-03-11 2015-10-29 삼성전자주식회사 통신 시스템에서 슬립모드 동작 제어 방법 및 장치
US8194576B2 (en) * 2009-03-27 2012-06-05 Research In Motion Limited Wireless access point methods and apparatus using dynamically-activated service intervals
US9612641B2 (en) * 2010-11-17 2017-04-04 International Business Machines Corporation Adjusting the connection idle timeout in connection pools
US9237572B2 (en) 2011-06-12 2016-01-12 Altair Semiconductor Ltd. Mitigation of interference between communication terminals in TD-LTE
US9354696B2 (en) * 2011-09-30 2016-05-31 Intel Corporation Credit based power management
US9247497B2 (en) * 2012-05-08 2016-01-26 Apple Inc. Communicating latency-sensitive data over a wireless data link
CN104427591A (zh) * 2013-08-22 2015-03-18 北京信威通信技术股份有限公司 一种通过寻呼检测降低终端功耗的方法和专用装置
KR102059409B1 (ko) * 2013-10-10 2019-12-26 한국전자통신연구원 Ip 기반의 슬립 모드 제어 방법
CN107734620B (zh) * 2017-11-29 2021-03-12 新华三技术有限公司 一种终端唤醒方法、装置及无线接入设备

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9304638D0 (en) * 1993-03-06 1993-04-21 Ncr Int Inc Wireless data communication system having power saving function
US6085090A (en) * 1997-10-20 2000-07-04 Motorola, Inc. Autonomous interrogatable information and position device
US6678258B1 (en) 1998-11-30 2004-01-13 Motorola, Inc. Method and apparatus for paging a communication unit in a packet data communication system
US6285662B1 (en) 1999-05-14 2001-09-04 Nokia Mobile Phones Limited Apparatus, and associated method for selecting a size of a contention window for a packet of data system
US6735454B1 (en) * 1999-11-04 2004-05-11 Qualcomm, Incorporated Method and apparatus for activating a high frequency clock following a sleep mode within a mobile station operating in a slotted paging mode
US6829493B1 (en) * 2000-04-24 2004-12-07 Denso Corporation Adaptive adjustment of sleep duration to increase standby time in wireless mobile stations
US6639907B2 (en) * 2000-09-26 2003-10-28 Qualcomm, Incorporated Method and apparatus for processing paging indicator bits transmitted on a quick paging channel
GB2375015A (en) 2001-04-27 2002-10-30 Ericsson Telefon Ab L M Communications networks

Also Published As

Publication number Publication date
EP1519599A3 (de) 2005-09-28
KR100594009B1 (ko) 2006-06-30
US20050070340A1 (en) 2005-03-31
EP1519599A2 (de) 2005-03-30
DE602004017098D1 (de) 2008-11-27
KR20050030510A (ko) 2005-03-30
CN1602013A (zh) 2005-03-30
US7289804B2 (en) 2007-10-30

Similar Documents

Publication Publication Date Title
EP1519599B1 (de) Verfahren zur Steuerung des Schlafzeitintervalls in einem drahtlosen Breitband-Zugangskommunikationssystem
EP1473880A2 (de) Verfahren zur Einstellung des Schlafzeitintervalls für drahtlose Breitbandzugriffskommunikationssysteme
KR100643784B1 (ko) 광대역 무선 접속 통신 시스템의 슬립 모드에서 주기적레인징 시스템 및 방법
EP2209344B1 (de) System und Verfahren zur Steuerung des Betriebszustands einer MAC-Schicht in einem drahtlosen Breitbandzugriffskommunikationssystem
US7526288B2 (en) System and method for controlling operation states of a medium access control layer in a broadband wireless access communication system
KR100735337B1 (ko) 광대역 무선 접속 통신 시스템의 슬립 모드에서 주기적레인징 시스템 및 방법
EP1473881B1 (de) Steuerung des Schlafmodus und Aktivmodus in einem drahtlosen Kommunikationssystem
AU2005287985B2 (en) A method of supporting operation of sleep mode in a wideband radio access system
AU2005239953B2 (en) Method for performing handover in broadband wireless access system
KR20080087351A (ko) 통신 시스템에서 데이터 송수신 시스템 및 방법
KR100762606B1 (ko) 광대역 무선 접속 통신 시스템에서 다운링크 채널 정보 변경에 따른 신호 송수신 시스템 및 방법
CN1930793B (zh) 用于在宽带无线接入通信系统中由移动用户台执行位置更新的方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20040809

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL HR LT LV MK

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL HR LT LV MK

AKX Designation fees paid

Designated state(s): DE FR GB

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 602004017098

Country of ref document: DE

Date of ref document: 20081127

Kind code of ref document: P

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20090716

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20100430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090831

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20170720

Year of fee payment: 14

Ref country code: GB

Payment date: 20170720

Year of fee payment: 14

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602004017098

Country of ref document: DE

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20180809

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190301

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180809